Sketchyphysics car model shaking

[robolettox2]

Hi!

I have been using Sketchyphysics for some 3 months now, mostly to make cars.

I have successfully made steerable and drivable cars with either no suspension or with simple (one block attached to a spring just going up and down) suspensions.

But anytime I try to do anything more complicated, like a MacPherson or a double wishbone suspension the same thing happens: the model starts to shake and move by itself until the vibrations destroy the model.

Even making all suspension system with non collidable pieces failed.

Could anyone help me to find out what am I doing wrong?

I have attached the model, created on SK2017 but saved as SK6.

MS physics version is 1.0.3

Thanks!

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chassissuspv6.skp